Ecology of the dorcas gazelle in northern Niger

Grettenberger, John F.

doi:10.1515/mamm.1987.51.4.527

Cited by 23 publications

(17 citation statements)

References 5 publications

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“…The low use B. aegyptiaca trees was surprising because this species was the most common at our study site and gazelles are known to feed on B. aegyptiaca (Grettenberger and Newby, 1986;Grettenberger, 1987;Hall, 1992). We do not have any logical explanation as to why Dorcas gazelles used B. aegyptiaca trees less than Acacia trees.…”

Section: Discussionmentioning

confidence: 75%

“…Livestock are therefore more likely to retreat to the shade of larger trees to avoid the high daytime temperatures and aid in water conservation. Humans also assist livestock in providing a form of interference competition because gazelles may avoid large trees visited by livestock and pastoralists, due to gazelles viewing humans as predators (Grettenberger, 1987). Gazelles maintain middens at larger trees, but may visit smaller Acacia trees in order to avoid livestock or feral donkeys and feed on leafy vegetation.…”

Section: Discussionmentioning

confidence: 99%

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Dorcas gazelle and livestock use of trees according to size in a hyper-arid landscape

Attum

Mahmoud²

2012

Journal of Arid Environments

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Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Dorcas gazelle and livestock use of trees according to size in a hyper-arid landscape

Attum

Mahmoud²

2012

Journal of Arid Environments

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“…Seasonal shifts in dry season diets towards dicots have been demonstrated in mountain gazelle (Baharav 1981), Thomson's gazelle, and Grant's gazelle (Stewart and Stewart 1971, Hoppe et al 1977, Spinage et al 1980. Though none of the plant species are the same as those found on the reserve, dorcas gazelle in Palestine (Baharav 1982) and Niger (Grettenberger 1987) also consumed more browse (mainly shrubs) during the dry season. A high proportion of forbs and shrubs in the diets during the dry season might be related to reduced protein and increased fiber in monocots ; dicots contain higher dry season levels of protein than grasses (Reed 1983, in Stelfox and Hudson 1986, Stelfox and Hudson 1986.…”

Section: Discussionmentioning

confidence: 99%

“…Mountain gazelle (G. gazella) in Palestine mainly graze, but browse more during the dry season (Baharav 1981). Dorcas gazelles, whose diets have been examined in Palestine (Baharav 1980(Baharav , 1982 and Niger (Grettenberger 1987), primarily browse shrubs but take annual grasses and forbs when available. Valverde (1957), Roussel-Gaussen (1975), and Essghaier (1981) listed plant species eaten by free-ranging dorcas gazelles, and Valverde added that 50 % of rumen material of an adult female and 10 % of an adult male in the Western Sahara consisted of larval locusts (Schistocerca).…”

Section: Introductionmentioning

confidence: 99%

Forage availability versus seasonal diets, as determined by fecal analysis, of dorcas gazelles in Morocco

Loggers¹

1991

Mammalia

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Diets of adult female and territorial adult male dorcas gazelles, determined by microhistological analysis, and availability of vegetation, defined as the biomass within 1.2 m of the ground of those species eaten during a season and measured using reference units, were measured during 3 seasons on a reserve in Morocco. Comparisons between sexes, seasonal diets, and use and availability were made using Spearman's rank correlation. Use and availability for individual species were also compared using /-tests that incorporated Bonferroni confidence intervals. Diets of females and males were highly correlated. Available biomass and diets changed between summer (July-Aug.), autumn (Oct.-Nov.), and spring (Mar.-Apr.). There was no relationship between diet and availability within a season. During summer, forbs and shrubs constituted 24 % of available forage but comprised 93 % of the diet. In autumn, consumption of shrubs increased to 63 % ; the high consumption of Zizyphus lotus relative to availability underscores its importance to the gazelles. Grasses in the diet increased to 50 % in spring, and shrubs decreased to 2%. Fruit from Z. lotus did not appear in diet analysis, though was an important component of summer diets. Close grouping of individual diets for animals that were associated suggets that the scale at which availability is measured must be reduced.Resume. -Le regime alimentaire des femelles adultes et des males adultes territoriaux de gazelles dorcas a ete mesure d'apres des analyses microhistologiques des feces et d'apres la biomasse ä 1,20 m du sol, de la vegetation disponible ; cette etude a ete faite aux endroits ou ces animaux se nourrissent pendant une saison, en utilisant des unites de reference, pendant trois saisons, dans une reserve au Maroc.En utilisant la correlation de Spearman, on a compare les sexes, le regime saisonnier et Putilisation et la disponibilite de la nourriture. On a aussi compare son utilisation et sa disponibilite pour les individus en utilisant des tests auxquels on a incorpore des intervalles de confiance de Bonferroni. On a constate aussi une grande correspondance entre ralimentation des femelles et celle des males. La biomasse disponible et la qualite de la nourriture ont varie entre 1'ete, 1'automne, et le printemps. II n'y a pas de relations entre la nourriture et la disponibilite au cours d'une meme saison. Pendant 1'ete, les plantes herbacees et les arbustes constituent 24 % de la nourriture disponible, mais representent 93 % du regime (75 % d'herbe et 18 % d'arbustes). En automne, la consommation d'arbustes s'accroit jusqu'ä 63 % ; la consommation elevee de Zizyphus lotus (28 %) par rapport ä sa disponibilite (2 %) souligne son importance pour les gazelles. La consommation de graminees est montee jusqu'ä 50 % au printemps et celle des arbustes a diminue jusqu'ä 2 % dans l'analyse de la nourriture, bien qu'ils soient une composante importante de 1'alimentation en ete. Mammalia, t. 55, n° 2, 1991.

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“…The mean population estimates of 111 and 99 dorcas gazelles in winter and spring 2009, respectively, in M'Sabih Talaa Reserve are 42.8 and 52.6% lower than Marraha's (1996) corresponding (Grettenberger, 1987), but higher than the density of the species in Makhtesh Ramon (mean annual rainfall 56 mm) in the Negev desert (0.002-0.020 ha −1 ; Lawes & Nanni, 1993). Both of these areas are sparsely vegetated, with most vegetation concentrated along watercourses.…”

Section: Discussionmentioning

confidence: 71%

Demographic decline of the last surviving Moroccan dorcas gazellesGazella dorcas massaesylain M'Sabih Talaa Reserve, Morocco

Baamrane

Znari

Loggers

et al. 2013

Oryx

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The formerly widespread but now Vulnerable dorcas gazelle Gazella dorcas has declined markedly during the last 2 decades. The semi-captive population in M'Sabih Talaa Reserve, west-central Morocco, is genetically distinct and may be the last remnant of the Moroccan dorcas gazelle G. dorcas massaesyla. The last estimate of the size of this population was c. 200, in 1996. To assess the current population we used line-transect distance sampling to survey this population over five seasons from These results indicate a decline of nearly 50% in , 15 years. The main conservation actions required for this subspecies are the suppression of poaching and feral dogs, the creation of other reserves to receive dorcas gazelles from M'Sabih Talaa (to avoid loss of the single population from a catastrophic event), and the implementation of a genetic management programme.

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Ecology of the dorcas gazelle in northern Niger

Cited by 23 publications

References 5 publications

Dorcas gazelle and livestock use of trees according to size in a hyper-arid landscape

Dorcas gazelle and livestock use of trees according to size in a hyper-arid landscape

Forage availability versus seasonal diets, as determined by fecal analysis, of dorcas gazelles in Morocco

Demographic decline of the last surviving Moroccan dorcas gazellesGazella dorcas massaesylain M'Sabih Talaa Reserve, Morocco

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